HABITUSThe tree stands 40 m tall, the clear bole is 4 to 30 m long, and the diameter is 100 cm. The buttress root is 4 m tall and 4 m width. The outside bark color is gray, gray to brown, light brown or light red. I. bijuga has shallow grooves bark. I. palambanica hasn't grove bark. The bark some peeled and some has a lot of peeled. The bark is tights and has black or dark red resin.

GENERAL CHARACTERISTICS

COLOURThe heartwood is brown-gray, brown-yellow, brown-red or black. The sapwood is light yellow. The sapwood has 5 - 7,5 cm tights. The sapwood can be differed from heartwood.

TEXTUREThe wood texture is evenly coarse.

GRAINThe grain is straight or occasionally slightly interlocked.

TOUCHThe wood surface is smooth.

GLOSSThe wood surface is glossy.

STRUCTURE

VESSELSThe vessels is spread, solitary and in grouped of 2 to 3 in radial direction, rarely clustered, The diameter is 150-200 m, the frequency is 1 to 2 per mm2.

PARENCHYMAThe apotracheal parenchyma has the shape of complete borders to the vessels.

RAYSThe rays are uniseriate and multiseriate, 50 to 125 m wide, 300 to 400 m high, and have frequency of 4 to 6 per mm.

FIBRESThe fibre length is 1181 m with a diameter of 21.6 m.

PHYSICAL PROPERTIES

Specific gravity 0.84 (0.63 - 1.04) g/cm3

Strength classII

ShrinkageShrinkage to oven-dry condition of I. bijuga is 3.3% (Radial) and 4.1% (Tangential).Shrinkage to air-dry condition of I. palembanica is 0.6% (Radial) and 0.7% (Tangential).